Heat exchanger

Abstract

A heat exchanger. The heat exchanger comprises a plurality of heat exchanger units (10) and at least one liquid distributor (20). The plurality of heat exchanger units (10) are arranged in a first preset direction and are in communication with each other, and two adjacent heat exchanger units (10) are in communication with each other via the liquid distributor (20). The liquid distributor has a fluid inlet (23) and a plurality of fluid outlets (24) that are in communication with each other. Two adjacent heat exchanger units (10) are sequentially defined as a first heat exchanger unit (11) and a second heat exchanger unit (12). The second heat exchanger unit (12) is divided into a plurality of heat exchange tube groups (120) in the first preset direction. The fluid inlet (23) is in communication with the first heat exchanger unit (11), and the plurality of fluid outlets (24) are in communication with the plurality of heat exchange tube groups (120).

Description

heat exchanger

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 202420616379.8, filed on March 28, 2024, entitled “Heat Exchanger,” which is hereby incorporated by reference in its entirety. Technical Field

[0003] The present application belongs to the technical field related to heat exchange equipment, and in particular relates to a heat exchanger. Background Art

[0004] A heat exchanger is a common heat exchange device. It usually includes two manifolds and multiple flat tubes. The multiple flat tubes are arranged between the two manifolds and are connected and communicated with the two manifolds respectively, so that the refrigerant introduced into the manifold can pass through the multiple flat tubes and then be discharged from the manifold. In this process, in order to improve the heat exchange efficiency of the flat tubes, fins are usually arranged on the multiple flat tubes at intervals. At present, existing heat exchangers usually set partitions inside the manifolds to separate them to achieve multi-flow liquid separation of the manifolds. However, when the above-mentioned heat exchanger is working, the multi-flow liquid separation of the refrigerant is uneven, which can cause frost in local areas when the heat exchanger is working. Summary of the Invention

[0005] In view of this, it is necessary to provide a heat exchanger for solving the above technical problems.

[0006] A heat exchanger comprises a plurality of heat exchanger units and at least one liquid separator, wherein the plurality of heat exchanger units are arranged in sequence along a first preset direction and are interconnected; among the plurality of heat exchanger units, two adjacent heat exchanger units are connected via the liquid separator; wherein the liquid separator has a fluid inlet and a plurality of fluid outlets that are interconnected, and the two adjacent heat exchanger units are sequentially set as a first heat exchanger unit and a second heat exchanger unit, wherein the second heat exchanger unit is sequentially divided into a plurality of heat exchange tube groups on the first preset direction, the fluid inlet is connected to the first heat exchanger unit, and the plurality of fluid outlets are connected to the plurality of heat exchange tube groups in a one-to-one correspondence.

[0007] In one embodiment, the second heat exchanger unit includes a collecting inlet pipe, which has multiple liquid separation chambers, and the multiple liquid separation chambers correspond one-to-one to the multiple heat exchange tube groups, and the multiple liquid separation chambers are independent of each other and respectively connected to the corresponding heat exchange tube groups; the first heat exchanger unit includes a collecting outlet pipe, which is connected to the fluid inlet, and the multiple fluid outlets are respectively connected to the multiple liquid separation chambers.

[0008] In one embodiment, a first collecting chamber is formed inwardly of the collecting outlet pipe, and the capacity of the first collecting chamber is greater than the capacity of any one of the liquid separation chambers.

[0009] In one embodiment, the first heat exchanger unit further includes a plurality of first flat tubes, the number of which is defined as N1, and the plurality of first flat tubes are respectively connected to and communicate with the header outlet pipe. The second heat exchanger unit further includes a plurality of second flat tubes, the number of which is defined as N2, and the plurality of second flat tubes are respectively connected to and communicate with the header inlet pipe. The relationship between the number of the plurality of first flat tubes N1 and the number of the plurality of second flat tubes N2 satisfies the following relationship: N1 < N2.

[0010] In one embodiment, the first heat exchanger unit further includes a plurality of first flat tubes, the number of which is defined as N1, and the plurality of first flat tubes are respectively connected to and communicate with the header outlet pipe; the second heat exchanger unit further includes a plurality of second flat tubes, the number of which is defined as N2, and the plurality of second flat tubes are respectively connected to and communicate with the header inlet pipe. The sum of the cross-sectional areas of the plurality of first flat tubes is less than the sum of the cross-sectional areas of the plurality of second flat tubes.

[0011] In one embodiment, the collecting inlet pipe includes a plurality of liquid separation cavities, and each of the liquid separation cavities surrounds and forms a corresponding liquid separation chamber.

[0012] In one embodiment, the collecting inlet pipe is an integrated structure and encloses a second collecting chamber. The heat exchanger also includes a plurality of partitions, and the plurality of partitions are arranged inside the collecting inlet pipe. The plurality of partitions divide the second collecting chamber into a plurality of liquid separation chambers in the first preset direction of the collecting inlet pipe.

[0013] In one embodiment, the liquid separator includes an inlet pipe and multiple capillaries, and the multiple capillaries are respectively connected to and communicated with the inlet pipe; the fluid inlet is arranged on the inlet pipe, and the multiple fluid outlets correspond one-to-one to the multiple capillaries, and the fluid outlets are arranged on the corresponding capillaries, and the multiple capillaries are respectively communicated with the inlet pipe; wherein, the inlet pipe is connected to and communicated with the collecting outlet pipe, the multiple capillaries correspond one-to-one to the multiple liquid separation chambers, and the capillaries are communicated with the corresponding liquid separation chambers.

[0014] In one embodiment, the lengths of the capillary tubes, which are connected to the plurality of liquid separation chambers in a one-to-one correspondence, increase sequentially in the first preset direction away from the collecting outlet pipe. By rationally arranging and connecting the first and second heat exchange units, the flow resistance of the refrigerant liquid separation is effectively adjusted, improving the uniformity of the overall heat exchange. In one embodiment, the liquid separator further includes a throttling device disposed on the inner wall of the inlet pipe; the throttling device is provided with multiple throttling holes, each of which is connected to the capillary tubes.

[0015] In one embodiment, a positioning protrusion is provided on the inner wall of the inlet pipe radially inwardly, and a positioning groove is provided on the outer peripheral wall of the throttling member, and the positioning protrusion is correspondingly embedded in the positioning groove.

[0016] In one embodiment, along the axial direction of the inlet pipe, the throttling member has a connecting section connected to the inner wall of the inlet pipe, and along the radial direction of the inlet pipe, the throttling member has a throttling section with the throttling hole, the connecting section is connected to the throttling section, and the connecting section has a connecting portion connected to the capillary tube in the inlet pipe, and the radial cross-sectional area of ​​the connecting portion gradually decreases from the throttling member to the capillary tube.

[0017] In one embodiment, the number of the heat exchanger units is two or three.

[0018] In one embodiment, the number of the heat exchanger units is three. Along the first preset direction, the three heat exchanger units are sequentially set as the second heat exchanger unit, the first heat exchanger unit and the second heat exchanger unit. The two second heat exchanger units are independently arranged and respectively connected to the first heat exchanger unit.

[0019] In one embodiment, the number of the heat exchanger units is three, and the first heat exchanger unit includes a collecting outlet pipe, and the collecting outlet pipe has two collecting chambers, and the two collecting chambers are independent of each other; wherein, there are two liquid separators, and the fluid inlets of the two liquid separators are connected to the two collecting chambers respectively and one by one, and the fluid outlets of the two liquid separators are connected to the two second heat exchanger units respectively and one by one.

[0020] Due to the application of the above technical solution, the present application has the following advantages over the related art: The heat exchanger claimed in the present application uses a liquid separator to achieve conductivity between two adjacent heat exchanger units, so that when the refrigerant flows through the two heat exchanger units, the liquid separator can distribute the refrigerant flowing through the previous heat exchanger unit to different positions in the height direction of the next heat exchanger unit. This can improve the uniformity of refrigerant liquid distribution, thereby preventing the occurrence of frost in localized areas during operation of the heat exchanger.

[0021] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] FIG1 is a schematic structural diagram of a heat exchanger provided in the first embodiment of the present application.

[0024] FIG2 is a schematic structural diagram of the heat exchanger unit and the liquid distributor provided in the first embodiment of the present application when assembled.

[0025] FIG3 is a schematic structural diagram of the heat exchanger unit and the liquid separator provided in the second embodiment of the present application when assembled.

[0026] FIG4 is a partial cross-sectional view of a heat exchanger unit provided in one embodiment of the present application.

[0027] FIG5 is a partial cross-sectional view of a heat exchanger unit provided in one embodiment of the present application.

[0028] FIG6 is a schematic structural diagram of a throttling member provided in an embodiment of the present application.

[0029] Reference numerals: 100, heat exchanger; 10, heat exchanger unit; 11, first heat exchanger unit; 111, manifold outlet pipe; 1111, manifold chamber; 112, first manifold inlet pipe; 113, first flat tube; 12, second heat exchanger unit; 120, heat exchange tube group; 121, manifold inlet pipe; 1211, liquid separation cavity; 1212, liquid separation chamber; 1213, first manifold chamber; 1214, second manifold Chamber; 122, second collecting outlet pipe; 123, second flat tube; 13, third heat exchanger unit; 14, partition; 20, liquid distributor; 21, inlet pipe; 214, positioning protrusion; 22, capillary tube; 23, fluid inlet; 24, fluid outlet; 240, throttling element, 242, throttling hole; 243, positioning groove; 245, connecting section; 246, throttling section; 247, connecting part; 30, fin. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] It should be noted that when an element is referred to as being “provided on” another element, it may be directly provided on the other element or there may be an intermediate element. When an element is considered to be “provided on” another element, it may be directly provided on the other element or there may be an intermediate element. When an element is considered to be “fixed to” another element, it may be directly fixed to the other element or there may be an intermediate element.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] As shown in Figures 1 to 3, a heat exchanger 100 provided in an embodiment of the present application includes a plurality of heat exchanger units 10 and at least one liquid separator 20. The plurality of heat exchanger units 10 are arranged in sequence along a first preset direction and are interconnected. Among the plurality of heat exchanger units 10, two adjacent heat exchanger units 10 are connected through the liquid separator 20; wherein the liquid separator 20 has a fluid inlet 23 and a plurality of fluid outlets 24 that are interconnected, and the two adjacent heat exchanger units 10 are sequentially set as a first heat exchanger unit 11 and a second heat exchanger unit 12. The second heat exchanger unit 12 is sequentially divided into a plurality of heat exchange tube groups 120 in the height direction, the fluid inlet 23 is connected to the first heat exchanger unit 11, and the plurality of fluid outlets 24 are connected to the plurality of heat exchange tube groups 120 in a one-to-one correspondence. In other words, the refrigerant flowing through the first heat exchanger unit 11 can be distributed by the liquid separator 20 to multiple heat exchange tube groups 120 at different height positions in the second heat exchanger unit 12. This effectively prevents the refrigerant from being distributed to the second heat exchanger unit 12 at a height that is too high, causing gas-liquid separation and affecting the uniformity of refrigerant distribution. Here, each heat exchanger unit 10 forms a flow path for refrigerant conduction in the heat exchanger 100.

[0034] It can be understood that the liquid separator 20 is used to achieve conduction between two adjacent heat exchanger units 10, so that when the refrigerant flows through the two heat exchanger units 10, the liquid separator 20 can distribute the refrigerant flowing through the previous heat exchanger unit 10 to different positions in the height direction of the next heat exchanger unit 10. In this way, the uniformity of the refrigerant separation can be improved, which can avoid the occurrence of frost in local areas when the heat exchanger 100 is working, and improve the overall heat exchange efficiency of the heat exchanger.

[0035] As shown in Figures 2 and 3, the second heat exchanger unit 12 includes a collecting inlet pipe 121, which has multiple liquid separation chambers 1212. The multiple liquid separation chambers 1212 correspond one-to-one to the multiple heat exchange tube groups 120. The multiple liquid separation chambers 1212 are independently arranged and respectively connected to the corresponding heat exchange tube groups 120; the first heat exchanger unit 11 includes a collecting outlet pipe 111, and the collecting outlet pipe 111 is connected to the fluid inlet 23, and the multiple fluid outlets 24 are respectively connected to the multiple liquid separation chambers 1212. In other words, the collecting inlet pipe 121 can separate the refrigerant into the multiple liquid separation chambers 1212 of the collecting inlet pipe 121 through the liquid separator 20, and realize the communication between the first heat exchanger unit 11 and the second heat exchanger unit 12. It should be noted that the number of liquid separation chambers 1212 in the collecting inlet pipe 121 can be specifically set according to the use requirements, which will not be elaborated here.

[0036] It should be noted that the first heat exchanger unit 11 includes a first header inlet pipe 112 and multiple first flat tubes 113. The number of the multiple first flat tubes 113 is defined as N1. The first header inlet pipe 112 and the header outlet pipe 111 are connected and communicated through N1 first flat tubes 113. In this way, when the refrigerant passes through the first heat exchanger unit 11, the refrigerant introduced by the first header inlet pipe 112 can flow to the header outlet pipe 111 after passing through N1 first flat tubes 113. During this process, heat exchange can be performed using N1 first flat tubes 113. In addition, the second heat exchanger unit 12 includes a second header outlet pipe 122 and a plurality of second flat tubes 123. The number of second flat tubes 123 is defined as N2. The header outlet pipe 111 and the second header outlet pipe 122 are connected and communicated via N2 second flat tubes 123. This allows the refrigerant flowing from the header outlet pipe 111 to the header inlet pipe 121 after being separated by the liquid separator 20 to flow through N2 second flat tubes 123 and be discharged from the second header outlet pipe 122. Of course, to improve the heat exchange efficiency of the heat exchanger 100 during operation, fins 30 may be installed on the N1 first flat tubes 113 and N2 second flat tubes 123. The number of second flat tubes 123 corresponding to each liquid separation chamber 1212 can be set according to specific usage requirements and will not be elaborated here.

[0037] In the present application, a first collecting chamber 1213 is formed inwardly of the collecting outlet pipe 111, and the capacity of the first collecting chamber 1213 is greater than the capacity of any one of the liquid separation chambers 1212. Here, the capacity of the liquid separation chamber 1212 can be made smaller than the capacity of the first collecting chamber 1213 by reducing the area or height of the liquid separation chamber 1212. In this way, when the refrigerant flows from the large-capacity first collecting chamber 1213 through the liquid separator 20 to the small-capacity liquid separation chamber 1212, the refrigerant can be accelerated. In this way, it can be used to solve the pressure drop when the refrigerant flows from the collecting outlet pipe 111 to the liquid separation chamber 1212 of the collecting inlet pipe 121, avoid the reduction of the flow rate of the refrigerant, and have the effect of improving the heat exchange efficiency of the heat exchanger 100 when it is working.

[0038] As shown in Figures 2 and 3, in the present application, the number N1 of the first flat tubes 113 is set to be less than the number N2 of the second flat tubes 123. Since the temperature of the refrigerant increases as the refrigerant passes through the first flat tubes 113 and flows to the second flat tubes 123, the present application sets the number of the second flat tubes 123 in the second heat exchanger unit 12 to be greater than the number of the first flat tubes 113 in the first heat exchanger unit 11. This can suppress the reduction in the heat exchange capacity of the refrigerant and improve the heat exchange uniformity of the heat exchanger 100 during operation.

[0039] As shown in Figures 2 and 3, in this application, the first heat exchanger unit 11 includes a plurality of first flat tubes 113, the number of which is defined as N1. The second heat exchanger unit 12 includes a plurality of second flat tubes 123, the number of which is defined as N2. The sum of the cross-sectional areas of the first flat tubes 113 in the first heat exchanger unit 11 is less than the sum of the cross-sectional areas of the second flat tubes 123 in the second heat exchanger unit 12. Here, the cross-sectional area of ​​the first flat tubes 113 refers to the area of ​​the refrigerant passageways in the first flat tubes 113, while the cross-sectional area of ​​the second flat tubes 123 refers to the area of ​​the refrigerant passageways in the second flat tubes 123. In other words, the heat exchange area of ​​the second heat exchanger unit 12 is larger than that of the first heat exchanger unit 11. This compensates for the lower heat exchange efficiency of the second flat tube 123 of the second heat exchanger unit 12 compared to the heat exchange efficiency of the first flat tube 113 of the first heat exchanger unit 11. This also prevents a decrease in the refrigerant's heat transfer efficiency, thereby improving the heat transfer uniformity of the heat exchanger 100 during operation. It should be noted that because the refrigerant first flows through the first flat tube 113, its temperature is lower than that of the refrigerant flowing through the second flat tube 123.

[0040] As shown in FIG2 , in the present application, the manifold 121 includes a plurality of liquid separation cavities 1211 , each of which encloses and forms a corresponding liquid separation chamber 1212 . In other words, the plurality of liquid separation chambers 1212 of the manifold 121 are formed by enclosing a plurality of independent liquid separation cavities 1211 . As shown in Figures 3 and 4, in some embodiments, in order to form multiple liquid separation chambers 1212 in the collecting inlet pipe 121, the present application can also form a second collecting chamber 1214 in an integrated structure in the collecting inlet pipe 121. The heat exchanger 100 also includes multiple partitions 14. The multiple partitions 14 are arranged inside the collecting inlet pipe 121. The multiple partitions 14 separate the second collecting chamber 1214 into multiple liquid separation chambers 1212 in the first preset direction of the collecting inlet pipe 121. By reasonably adjusting the heights of the multiple liquid separation chambers 1212, the gas-liquid separation of the refrigerant in the liquid separation chamber 1212 can be effectively avoided, which affects the uniformity of the refrigerant distribution.

[0041] In the present application, the liquid separator 20 includes an inlet pipe 21 and multiple capillaries 22, the fluid inlet 23 is arranged on the inlet pipe 21, multiple fluid outlets 24 correspond one-to-one to the multiple capillaries 22, and the fluid outlets 24 are arranged on the corresponding capillaries 22, and the multiple capillaries 22 are respectively connected and communicated with the inlet pipe 21; wherein, the inlet pipe 21 is connected and communicated with the collecting outlet pipe 111, the multiple capillaries 22 correspond one-to-one to the multiple liquid separation chambers 1212, and the capillaries 22 are communicated with the corresponding liquid separation chambers 1212.

[0042] In one embodiment, the lengths of the capillary tubes 22, which are connected to the plurality of liquid separation chambers 1212 in a one-to-one correspondence, increase sequentially in a first predetermined direction away from the manifold outlet 111. The specification further explains that a rational layout connecting the first heat exchanger unit 11 and the second heat exchanger unit 12 effectively adjusts the flow resistance of the refrigerant liquid separation and improves the uniformity of the overall heat exchange.

[0043] The liquid separator 20 also includes a throttle member 240, which is disposed on the inner wall of the inlet pipe 21 and has a plurality of throttle holes 242 disposed therein. Each of the throttle holes 242 is in communication with the capillary tubes 22. As the refrigerant flows through the throttle member 240, the throttle holes 242 disturb the refrigerant, resulting in more uniform mixing of the refrigerant and even distribution of the refrigerant within the capillary tubes 22, thereby improving the liquid separation efficiency of the liquid separator.

[0044] In one embodiment, a positioning protrusion 214 is radially inwardly projected from the inner wall of the inlet pipe 21, and a positioning groove 243 is formed on the outer peripheral wall of the throttle member 240. The positioning protrusion 214 is correspondingly embedded in the positioning groove 243. This arrangement can ensure that the throttle member 240 is positioned inside the inlet pipe 21. At the same time, the positioning groove of the throttle member 240 is protruded from the inlet pipe 21, causing the refrigerant to further be disturbed after flowing through the throttle hole 242, thereby improving the uniformity of refrigerant separation.

[0045] As shown in Figures 5 and 6, in one embodiment, the throttle member 240 has a connecting section 245 connected to the inner wall of the inlet pipe 21 along the axial direction of the inlet pipe 21. Along the radial direction of the inlet pipe 21, the throttle member 240 has a throttle section 246 with a throttle hole 242. The connecting sections 245 and 246 are connected. The connecting section 245 has a connecting portion 247 in the inlet pipe 21 that connects to the capillary tube 22. The radial cross-sectional area of ​​the connecting portion 247 gradually decreases from the throttle member 240 to the capillary tube 22. This arrangement can guide the flow of refrigerant, increase the flow rate, and improve the refrigerant distribution efficiency.

[0046] As shown in Figure 2, the heat exchanger 100 provided in the first embodiment of the present application has two heat exchanger units 10. That is, the heat exchanger 100 of this embodiment has two refrigerant flows for heat exchange.

[0047] As shown in Figure 3, the number of heat exchanger units 10 in the heat exchanger 100 provided in the second embodiment of the present application is three. Along the first preset direction, the three heat exchanger units 10 are sequentially set as the second heat exchanger unit 12, the first heat exchanger unit 11 and the second heat exchanger unit 12. The two second heat exchanger units 12 are independently arranged and respectively connected to the first heat exchanger unit 11. That is to say, the heat exchanger 100 uses the first heat exchanger unit 11 located in the middle to conduct the refrigerant to the second heat exchanger units 12 on the upper and lower sides, respectively, so that the overall structure of the heat exchanger 100 can be made more compact.

[0048] As shown in Figure 3, in this embodiment, the manifold outlet pipe 111 in the first heat exchanger unit 11 has two manifold chambers 1111, which are independent of each other. This prevents gas-liquid separation of the refrigerant at the manifold outlet pipe 111, thereby improving the uniformity of refrigerant distribution. Two liquid separators 20 are provided, and the fluid inlets 23 of the two liquid separators 20 are connected to the two manifold chambers 1111 in a one-to-one correspondence. The fluid outlets 24 of the two liquid separators 20 are connected to the two second heat exchanger units 12 in a one-to-one correspondence. This allows the refrigerant introduced from the first manifold inlet pipe 112 of the first heat exchanger unit 11 to flow through the corresponding first flat tubes 113 to the two manifold chambers 1111, and then to flow to the corresponding two second heat exchanger units 12 in a liquid separation manner through the liquid separators 20 on the two manifold chambers 1111.

[0049] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present application and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. A heat exchanger, characterized in that: The device comprises a plurality of heat exchanger units and at least one liquid separator, wherein the plurality of heat exchanger units are arranged in sequence along a first preset direction and are interconnected; and among the plurality of heat exchanger units, two adjacent heat exchanger units are connected via the liquid separator; In which, the liquid separator has a fluid inlet and multiple fluid outlets that are interconnected, and the two adjacent heat exchanger units are set as the first heat exchanger unit and the second heat exchanger unit in sequence. The second heat exchanger unit is divided into multiple heat exchange tube groups in sequence in the first preset direction, and the fluid inlet is connected to the first heat exchanger unit, and the multiple fluid outlets are connected to the multiple heat exchange tube groups one by one.

2. The heat exchanger according to claim 1, wherein The second heat exchanger unit includes a header inlet pipe having a plurality of liquid separation chambers, the plurality of liquid separation chambers corresponding one-to-one to the plurality of heat exchange tube groups, and the plurality of liquid separation chambers are independent of each other and respectively communicated with the corresponding heat exchange tube groups; The first heat exchanger unit includes a collecting outlet pipe, the collecting outlet pipe is connected to the fluid inlet, and the multiple fluid outlets are respectively connected to the multiple liquid separation chambers.

3. The heat exchanger according to claim 2, wherein: A first collecting chamber is formed inwardly of the collecting outlet pipe, and the capacity of the first collecting chamber is greater than the capacity of any one of the liquid separation chambers.

4. The heat exchanger according to claim 2, wherein: The first heat exchanger unit further includes a plurality of first flat tubes, the number of which is defined as N1, and the plurality of first flat tubes are respectively connected to and communicate with the header outlet pipe; the second heat exchanger unit further includes a plurality of second flat tubes, the number of which is defined as N2, and the plurality of second flat tubes are respectively connected to and communicate with the header inlet pipe; The relationship between the number N1 of the plurality of first flat tubes and the number N2 of the plurality of second flat tubes satisfies the following relationship: N1<N2.

5. The heat exchanger according to claim 2, wherein: The first heat exchanger unit further includes a plurality of first flat tubes, the number of which is defined as N1, and the plurality of first flat tubes are respectively connected to and communicate with the header outlet pipe; the second heat exchanger unit further includes a plurality of second flat tubes, the number of which is defined as N2, and the plurality of second flat tubes are respectively connected to and communicate with the header inlet pipe; The sum of the cross-sectional areas of the plurality of first flat tubes is smaller than the sum of the cross-sectional areas of the plurality of second flat tubes.

6. The heat exchanger according to claim 2, wherein: The collecting inlet pipe includes a plurality of liquid separation cavities, and each of the liquid separation cavities surrounds and forms a corresponding liquid separation chamber.

7. The heat exchanger according to claim 2, wherein: The collecting inlet pipe is an integrated structure and encloses a second collecting chamber. The heat exchanger also includes a plurality of partitions, which are arranged inside the collecting inlet pipe. The plurality of partitions divide the second collecting chamber into a plurality of liquid separation chambers in the first preset direction of the collecting inlet pipe.

8. The heat exchanger according to claim 2, wherein: The liquid dispenser includes an inlet tube and a plurality of capillaries, the fluid inlet is provided on the inlet tube, the plurality of fluid outlets correspond one-to-one to the plurality of capillaries, and the fluid outlets are provided on the corresponding capillaries, and the plurality of capillaries are respectively connected to the inlet tube; The inlet pipe is connected to and communicated with the collecting outlet pipe, the plurality of capillaries correspond one-to-one to the plurality of liquid separation chambers, and the capillaries are communicated with the corresponding liquid separation chambers.

9. The heat exchanger according to claim 8, wherein: In the first preset direction away from the collecting outlet pipe, the lengths of the plurality of capillaries connected to the plurality of liquid separation chambers in a one-to-one correspondence increase sequentially.

10. The heat exchanger according to claim 8, wherein The liquid distributor further comprises a throttling member, which is arranged on the inner wall of the inlet pipe; Wherein, the throttling member is provided with a plurality of throttling holes, and the plurality of throttling holes are all communicated with the capillary tube.

11. The heat exchanger according to claim 10, wherein: The inner wall of the inlet pipe is provided with a positioning protrusion protruding radially inwardly, and the outer peripheral wall of the throttling member is provided with a positioning groove, and the positioning protrusion is correspondingly embedded in the positioning groove.

12. The heat exchanger according to claim 10, wherein Along the axial direction of the inlet pipe, the throttling member has a connecting section connected to the inner wall of the inlet pipe. Along the radial direction of the inlet pipe, the throttling member has a throttling section with the throttling hole. The connecting section is connected to the throttling section. The connecting section has a connecting portion connected to the capillary tube in the inlet pipe. The radial cross-sectional area of ​​the connecting portion gradually decreases from the throttling member to the capillary tube.

13. The heat exchanger according to any one of claims 1 to 12, wherein: The number of the heat exchanger units is two or three.

14. The heat exchanger according to claim 13, wherein The number of the heat exchanger units is three. Along the first preset direction, the three heat exchanger units are sequentially set as the second heat exchanger unit, the first heat exchanger unit and the second heat exchanger unit. The two second heat exchanger units are independently arranged and respectively connected to the first heat exchanger unit.

15. The heat exchanger according to claim 13, wherein There are three heat exchanger units, and the first heat exchanger unit includes a collecting outlet pipe, and the collecting outlet pipe has two collecting chambers, and the two collecting chambers are independent of each other; There are two liquid separators, the fluid inlets of the two liquid separators are connected to the two collecting chambers in a one-to-one correspondence, and the fluid outlets of the two liquid separators are connected to the two second heat exchanger units in a one-to-one correspondence.

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